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SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = 'b0b081dbcaccade003b57b38a2566ede0c0f76e59e3eda8c0a62dec1695cda6e' 
  AND token = 'vtbB8zyVaAwAiYkse2LjSBkdb19GHbZ4Z1tU/HOAY1M=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00029

JSON explain

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