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SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = '171eb93e35e3174b0ebe29ea6c08522e318a650cdf3b42b4ffb7fd26260cdf0f' 
  AND token = 'frhdF/sTBDMXgX3S1U719mxCCRR8JvuBcJFt11Nm7yQ=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00037

JSON explain

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