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SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = '4c0c8bf7004cb5ee7839ce1590cd2818dbf6096d29b31a13c0343309b2d6ab56' 
  AND token = '7fVii0zDA0v1jpnPzcl7/4pc+hal/NkMFG5ayXauN2Y=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00037

JSON explain

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