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SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = 'c6f52df254b4e5759ce7ff9e3a312e2fa2cdef111fb264932148d444eea11dce' 
  AND token = 'gJpwkvWiePlVd+TIIC2jftVlL1M4I7XrezpQICL46yw=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00029

JSON explain

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