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SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = 'f5790a3aef39c5e487350530bf1159e30cb5e2bc00f518b7224e0f8c6f4e7019' 
  AND token = '2ZOjE2k4b/I6xXUcWjzAzmg3Ap5affO9kwigZacMTe4=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00040

JSON explain

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