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SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = 'be3607694a784ba10deba1ccebc47d1c10a8c37c801e983d1bf46c0357c144c7' 
  AND token = 'FYDZRFwdjIJezUBdsVEknJPbSSEJBRYTmzGnJA8FSTo=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00046

JSON explain

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