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SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = '97e687a04e1876c3567026a317f5a01d07792845572fb5caca340ac1a45b4202' 
  AND token = 'nfVQnlHY9PEOaydt1D7Vz9QCzN4dubK4YtpcoWZfkEQ=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00047

JSON explain

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