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SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = 'c09c257de5baa8c215d9127ce0928f145ba4ec102b9f89136f94900a05c8cd0b' 
  AND token = 'OkXQrVOcHR73KBc0PpA3X3ogPJ/vOW7N34YxAD4eyYQ=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00030

JSON explain

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