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SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = '07cb841a8769ce68ec5fd0f3bf2ba19c80039f8a6cf6b31dd053e2d84e21b84f' 
  AND token = 'eXDtdpWbfJ3FuSP7p/3OPsKwHB50dJE16GErrFwe3hs=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00046

JSON explain

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