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SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = '639d6b86501d42f4a8bf537f2960686ecc32a74161620e947ac0b82b11cf1bf3' 
  AND token = 'Q7BhTg1aEJ98wVWihSsYe4pw5fvH3HBPxH5EcefYASE=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00033

JSON explain

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