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SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = 'ea96b2ffc3b30d420fddca7a327b71ee51e06d8f031ad4a9b8c47c9b78900882' 
  AND token = '+McoUnBSuNQbvL+EmOhbZ3iy3gDZiBfFEvLoN9rqOls=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00028

JSON explain

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