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SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = 'e84f2414194597813a0c2d46969474da6b913172417a993c1221fbdbeb0a7a90' 
  AND token = '1dMVIkLiSkvMZrUHNEErvG2EJgVN6C3fP/UnCiQxFAs=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00029

JSON explain

{
  "query_block": {
    "select_id": 1,
    "message": "no matching row in const table"
  }
}