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SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = '5a6f0bb77263026263b02c07085537a82b029fade27695e6e7c6a3a1844095fe' 
  AND token = 'cfhN2wF+0kZkx/686wFp5CioqQ3aP/SRSsRsNM7LNSA=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00030

JSON explain

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