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SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = '2e6bd4d4d12268f5d230529f940c06fe0a06d0faf497c9f6e0470dbcb4fdd3b1' 
  AND token = 'b7vSIDIxkLK5Zig7H4v5MUbXp7VVR5o+LVw00m6HVhg=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00034

JSON explain

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