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SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = '48296bc31dd2aa592a42a2d5bff6570aecae4966fdc5322944e86e415f9f5a73' 
  AND token = 'Y0FPP2MprwoBakz+BHTwFLvod0aOXJ6WpalARgPO6ws=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00023

JSON explain

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