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SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = '5cb777fcbc79def28eb4b5d2ecef0d767fc59e63710d05536cf46060535d2a86' 
  AND token = 'DmYnX0lktN1/5rVbj12Kx0KzdWETyuKv0Rr5jaXGRU0=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00019

JSON explain

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