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SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = '50fd6f5df15572e49cc95b4005aad69ca6bbeb04d5a72b6e68b679c4880fbd7e' 
  AND token = 'AnrqcnTdX+O4fJMMeiCKaAN74JNOojP6486lvd+XLsg=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00026

JSON explain

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