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SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = '775f7357c3cc57b95bce69bbab06a54bc799b25943bde1a5b9538c4b065186f1' 
  AND token = 'jkNxwbhSCnbGZHijsh8XFLV4M4Ktc5FDty5vf2qzqA4=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00032

JSON explain

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