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SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = '30961abed4f6b09fd73da349182bbd5f83438490d8d9437b10be56e7eb4e2aeb' 
  AND token = 'lchW1H0D8RYVVYwuO10VoGItpSkel8TwQhELdtennuI=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00030

JSON explain

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