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SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = 'a9f0a307aa3d8f7430f23df06eaafaeaad4b1319c828c17c39989751d4c7671b' 
  AND token = 'i+DYSezb6s4+bF5s2EsLTlqMugcW6pEweLEXdGQ+hl4=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00032

JSON explain

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